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Latex how to write backslash in Latex with or without amssymb : backslash , setminus, smallsetminus
To write backslash symbol in LateX, you must use \backslash or \setminus command:
$$a\backslash b$$
$$A\setminus B$$
which gives:
$$a\backslash b$$
$$A\setminus B$$
To write backslash symbol in LateX using package amssymb you must use \smallsetminus command:
\documentclass{article}
\usepackage{amssymb}
\begin{document}
$$A \smallsetminus B$$
\end{document}
$$A \smallsetminus B$$